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Change Process in Substances

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←View All Chemistry Questions!


Change Process in Substances

Question

Name the process which takes place when:
(a) Solid Carbon (Iv) Oxide (dry ice) changes directly into gas
(b) A red litmus paper turns white when dropped into chlorine water
(c) Propene gas molecules are converted into a giant molecule

Answer

(a) sublimation
(b) Bleaching action
(c) Polymerization


   Related Questions

Q. Name the process which takes place when: Solid Carbon (IV) oxide (dry ice) changes directly into gas. A red litmus paper turns white when dropped into chlorine water. Propene gas molecules are converted into a giant molecule. Q. Explain why very little Carbon (IV) oxide gas is evolved when dilute sulphuric (VI) acid is added to lead (II) carbonate. Q. The set up below was used to collect a dry sample of a gas. Give two reasons why the set up cannot be used to collect carbon (IV) oxide. Q. A compound of carbon, hydrogen and oxygen contains 71.12% oxygen, 2.2% hydrogen and rest carbon. If it has a relative molecular mass of 90. Determine the empirical formula of the compound C = 12, 0 = 6 H = 1. Determine the molecular formula of the compound. Q. Graphite is one of the allotropes of carbon. Name one other element that exhibits allotropy. Explain why graphite is used as a lubricant. Q. 10cm³ of a gaseous hydrocarbon, C2Hx required 30cm³ of oxygen for complete combustion. If steam and 20cm³ of carbon (IV) oxide were produced, what is the value of X? Q. 12.0 cm3 of 0.05 M hydrochloric acid reacted with calcium hydrogen carbonate to form calcium chloride, water and carbon IV oxide. Write the chemical equation for the reaction. Calculate the number of moles of hydrochloric acid used. Determine the mass of calcium hydrogen carbonate used. (Ca = 40, C =12, H = 1,O=16). Q. The diagram below show a burning jiko in a room which has sufficient supply of oxygen. Using chemical equation, explain what happens at A and B. State the main danger of emitting excess carbon iv oxide into the atmosphere. Q. Diamond and graphite are allotropes of carbon. In terms of structure and bonding. Explain the following. Diamond is used in drilling through hard rocks. Graphite is used as a lubricant. Q. A compound has an empirical formula C3H6O and a relative formula mass of 116.a. Determine its molecular formula (H = 1.0, C = 12.0, O = 16.0). b. Calculate the percentage composition of carbon by mass in the compound. Q. The flow chart below shows the preparation of carbon (II) oxide and its reaction. Name the type of reaction that takes place between H2C2O2 and conc. H2SO4. Write an equation for the production of B and C. State two uses of carbon (II) oxide.

   Related Topics

Introduction to Chemistry Simple Classification of Substances Acids, Bases and Indicators Air Oxygen and Combustion Chemical Properties of Oxygen Water and Hydrogen - Water Water and Hydrogen - Hydrogen Water and Hydrogen - Reactions of water with Metals